[UgaTheDev]

In tests/smoke/test_train.py::test_training_feature_matrix, the DeepSpeed
branch was:

else:
    pytest.xfail("DeepSpeed not currently functional. OOMs during backprop.")
    if cpu_offload:
        pytest.xfail("DeepSpeed CPU Adam isn't currently building correctly")
    train_args.deepspeed_options.cpu_offload_optimizer = cpu_offload

pytest.xfail() raises immediately, so the if cpu_offload: block and the
cpu_offload_optimizer assignment below it could never run — both
DeepSpeed-parametrized cases (cpu_offload=True and cpu_offload=False)
always hit the same generic message and the more specific CPU-Adam reason was
dead code.

This reorders the checks so the cpu_offload=True case reports its own
specific, more accurate xfail reason, and only the cpu_offload=False case
falls through to the general "OOMs during backprop" one:

else:
    if cpu_offload:
        pytest.xfail("DeepSpeed CPU Adam isn't currently building correctly")
    pytest.xfail("DeepSpeed not currently functional. OOMs during backprop.")

Verified both xfail messages are now reachable by simulating the branch
logic standalone (can't run the real test without GPU hardware / the full
package installed):

cpu_offload=True: raised XFailed: DeepSpeed CPU Adam isn't currently building correctly
cpu_offload=False: raised XFailed: DeepSpeed not currently functional. OOMs during backprop.

Also confirmed the file still parses (python3 -m py_compile).

This is a test-only change — no non-test code touched, no new coverage
claimed, just makes the two existing xfail reasons distinguishable per the
docstring/#705 finding: "the second xfail below it for DeepSpeed plus CPU
offload... that block and the deepspeed_options.cpu_offload_optimizer
assignment after it are unreachable."

Originally flagged in #705 (comment from 2026-07-29).

Summary by CodeRabbit

• Tests
  • Updated DeepSpeed test expectations to distinguish between CPU offload build failures and backpropagation out-of-memory failures.

[coderabbitai]

Walkthrough

The DeepSpeed smoke test now assigns cpu_offload_optimizer before its expected-failure checks. The CPU-offload case reaches the CPU Adam build xfail; other DeepSpeed cases reach the backpropagation OOM xfail.

Changes: DeepSpeed smoke-test configuration

Layer / File(s)	Summary
CPU-offload xfail routing tests/smoke/test_train.py	The test assigns cpu_offload_optimizer before checking expected failures. CPU offload selects the CPU Adam build xfail; otherwise, the test selects the backpropagation OOM xfail.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Possibly related issues

• Issue 705 covers backend-matrix smoke tests and feature-flag coverage. This change updates the DeepSpeed CPU-offload case in that test scope.

Suggested reviewers: maxusmusti

Merge Risk: Minimal · up to adef9

No merge-blocking risk is identified in the test-only change.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly describes the test change: making the DeepSpeed CPU-offload xfail reachable.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 1 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches

Generate unit tests (beta)

• Create a new PR

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[Maxusmusti]

The analysis is correct — pytest.xfail() raises immediately, so the if cpu_offload: branch and the assignment after it were unreachable on main (all five lines landed together in eca9092, so it looks like an ordering slip rather than an intentional blanket override).

One nit: rather than deleting train_args.deepspeed_options.cpu_offload_optimizer = cpu_offload, I'd move it above the xfails. The field still exists on DeepSpeedOptions, and if someone later removes the xfails to re-enable DeepSpeed, the cpu_offload=True case would otherwise silently run identically to cpu_offload=False:

else:
    train_args.deepspeed_options.cpu_offload_optimizer = cpu_offload
    if cpu_offload:
        pytest.xfail("DeepSpeed CPU Adam isn't currently building correctly")
    pytest.xfail("DeepSpeed not currently functional. OOMs during backprop.")

(Minor: the CPU-Adam reason dates from Jan 2025 and may not reflect current deepspeed 0.17.5 behavior, but since it's only an xfail message that's not blocking.)

[UgaTheDev]

Good catch, thanks. Moved cpu_offload_optimizer = cpu_offload above the xfails as suggested, so re-enabling DeepSpeed later will not silently ignore the cpu_offload case. Pushed.

[coderabbitai]

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Failed pre-merge checks:
- Docstring Coverage:
Write docstrings for the functions missing them to satisfy the coverage
threshold.

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